Create varaverk.plg on flash (/boot/config/plugins/varaverk/varaverk.plg). On boot, rebuild_cron copies it to /var/log/plugins/ so update_cron natively picks up varaverk.cron and merges it into /etc/cron.d/root. With the .plg in place the dev-mode direct-inject fallback in vv_cron_rebuild() is no longer needed and has been removed.